fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir()
Use extent buffer based infrastructure to re-implement btrfs_readdir().
Along this rework, some small corner cases fixed:
- Subvolume tree mtime
Mtime of a subvolume tree is recorded in its root item, since there is
no INODE_ITEM for it.
This needs extra search from tree root.
- Output the unknown type
If the DIR_ITEM is corrupted, at least don't try to access the memory
out of boundary.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 111a5a6..0cf5e63 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1285,6 +1285,11 @@
struct btrfs_path *path, u64 dir,
const char *name, int name_len,
int mod);
+typedef int (*btrfs_iter_dir_callback_t)(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ struct btrfs_dir_item *di);
+int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
+ btrfs_iter_dir_callback_t callback);
/* inode.c */
int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
struct btrfs_root **root_ret, u64 *ino_ret,